{"id":14152,"date":"2025-04-28T17:18:01","date_gmt":"2025-04-28T15:18:01","guid":{"rendered":"https:\/\/www.telescoop.nl\/?p=14152"},"modified":"2025-11-27T19:32:56","modified_gmt":"2025-11-27T18:32:56","slug":"k2-18b-planet","status":"publish","type":"post","link":"https:\/\/www.telescoop.nl\/en\/k2-18b-planeet\/","title":{"rendered":"K2-18b planet: everything you need to know about this extraordinary discovery"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"14152\" class=\"elementor elementor-14152\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-96b18af e-flex e-con-boxed e-con e-parent\" data-id=\"96b18af\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-38cee2d1 elementor-widget elementor-widget-text-editor\" data-id=\"38cee2d1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\n<p class=\"wp-block-paragraph\">The <strong>k2-18b planet<\/strong> has become one of the most intriguing exoplanets in recent years. Not because we have found life there, but because scientists have detected traces that may indicate biological processes. What makes K2-18b so special? And how far along are we really in the search for life? In this blog, we dive deep into the facts<\/p>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8d39b2df wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"597\" class=\"wp-image-14153\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/Esa-hubble-k2-18a_impression-1024x597.jpg\" alt=\"k2-18b\" title=\"\" srcset=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/Esa-hubble-k2-18a_impression-1024x597.jpg 1024w, https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/Esa-hubble-k2-18a_impression-300x175.jpg 300w, https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/Esa-hubble-k2-18a_impression-768x448.jpg 768w, https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/Esa-hubble-k2-18a_impression-1536x896.jpg 1536w, https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/Esa-hubble-k2-18a_impression-2048x1195.jpg 2048w, https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/Esa-hubble-k2-18a_impression-990x578.jpg 990w, https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/Esa-hubble-k2-18a_impression-441x257.jpg 441w, https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/Esa-hubble-k2-18a_impression-800x467.jpg 800w, https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/Esa-hubble-k2-18a_impression-150x88.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\n<figcaption class=\"wp-element-caption\">By ESA\/Hubble, CC BY 4.0, https:\/\/commons.wikimedia.org\/w\/index.php?curid=82082659<\/figcaption>\n<\/figure>\n<\/div>\n<\/div>\n\n<h2 class=\"wp-block-heading\">What is the K2-18b planet?<\/h2>\n\n<p class=\"wp-block-paragraph\">K2-18b is an exoplanet at about <strong>124 light years<\/strong> distance from Earth, located in the constellation <strong>Leo<\/strong>. The planet was discovered in 2015 during the second phase of NASA's Kepler mission (the K2 mission).<br \/>It orbits a relatively cool red dwarf star, <strong>K2-18<\/strong>, and is located within the <strong>habitable zone<\/strong> - the area around a star where liquid water could exist.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Key properties of K2-18b:<\/strong><\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Beam:<\/strong> about 2.5 times the size of Earth.<\/li>\n\n<li><strong>Mass:<\/strong> about 8.6 times heavier than Earth.<\/li>\n\n<li><strong>Job period:<\/strong> one year lasts only <strong>33 earth days<\/strong>.<\/li>\n\n<li><strong>Distance to his star:<\/strong> about <strong>0.142 astronomical units (AE)<\/strong> (For comparison, the earth is 1 AU from the sun).<\/li>\n\n<li><strong>Tidal lock:<\/strong> Probably yes - one side always facing the star.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Due to its short orbital period and the red dwarf's weak radiation, K2-18b remains cool enough to potentially hold water, despite its proximity to its star.<\/p>\n\n<p class=\"wp-block-paragraph\">What makes this planet extra special is its unknown nature: it is between a super-Earth and a mini-Neptune in terms of size. We do not know of any comparable object in our own solar system, so scientists are not yet quite sure whether it is an ocean world, a gas giant or something in between.<\/p>\n\n<h2 class=\"wp-block-heading\">What do experts say about the possible biosignatures on K2-18b?<\/h2>\n\n<p class=\"wp-block-paragraph\">On April 16, 2025, a team of astronomers, led by Nikku Madhusudhan of the University of Cambridge, published new results in which they claimed <strong>dimethyl sulfide (DMS)<\/strong> detected in the atmosphere of K2-18b.<br \/>DMS on Earth comes almost exclusively from living organisms such as plankton, so the discovery caused much excitement. Some media outlets even headlined that possible extraterrestrial life had been found.<\/p>\n\n<p class=\"wp-block-paragraph\">National Geographic, however, spoke with <strong>ten independent experts<\/strong> and their reactions were divided:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Skeptics<\/strong> (such as Clara Sousa-Silva and Ryan MacDonald) point to the likelihood of <strong>false-positive results<\/strong>. They claim that the equation with 20 molecules leaves room for error, and that the 'three sigma' reliability may have been enhanced by selective data processing (\"statistical hacking\").<\/li>\n\n<li><strong>Cautious optimists<\/strong> (like Laura Kreidberg) consider the research carefully conducted, but stress that scientific caution remains necessary.<\/li>\n\n<li><strong>Others<\/strong> point out that DMS has also been found in dead comets (such as on comet 67P), meaning that it is not necessarily produced by life.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">In short, it is an indication, but far from definitive proof.<\/p>\n\n<h2 class=\"wp-block-heading\">Is K2-18b really habitable?<\/h2>\n\n<p class=\"wp-block-paragraph\">Although K2-18b is in the habitable zone, this does not automatically mean it is a habitable world.<br \/>Several scenarios are circulating:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>According to some models, K2-18b would be a <strong>Hycean World<\/strong> could be, with a deep ocean beneath a thin hydrogen atmosphere - a favorable environment for microbial life.<\/li>\n\n<li>However, other researchers, who reanalyzed earlier data, found <strong>no evidence for carbon dioxide<\/strong> (CO\u2082) - an essential ingredient for a stable, livable atmosphere. Without CO\u2082, it would be more of a <strong>inhospitable gas giant<\/strong> are.<\/li>\n\n<li>There are also models where the 'ocean' of K2-18b is not made of water, but of <strong>magma<\/strong> would exist due to extremely high temperatures.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">In addition, K2-18b <strong>2.6 times larger<\/strong> and almost <strong>nine times as heavy<\/strong> as the Earth. As a result, the surface pressure, if any, may be extremely high - possibly unsuitable for life as we know it.<\/p>\n\n<p class=\"wp-block-paragraph\">Research lead Madhusudhan remains optimistic: \"There are still open questions, but they do not exclude life.\"<\/p>\n\n<h2 class=\"wp-block-heading\">Why does this discovery remain important?<\/h2>\n\n<p class=\"wp-block-paragraph\">Even if no direct evidence of life is found, the discovery around K2-18b remains revolutionary.<br \/>Thirty years ago we didn't even know exoplanets existed; today we analyze their atmospheres in search of molecules that may indicate life.<\/p>\n\n<p class=\"wp-block-paragraph\">As philosopher of science Peter Vickers put it:<\/p>\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\"If we find signs of life on one of the first habitable planets we study, then it's likely that life is everywhere.\"<\/p>\n<\/blockquote>\n\n<p class=\"wp-block-paragraph\">Or as astrobiologist Michael Wong says:<\/p>\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\"We are only at the beginning. But what a privilege it is that we can even ask these questions.\"<\/p>\n<\/blockquote>\n\n<h2 class=\"wp-block-heading\">Why is K2-18b so much talked about?<\/h2>\n\n<p class=\"wp-block-paragraph\">In 2019, the Hubble Space Telescope found <strong>water vapor<\/strong> in the atmosphere of K2-18b. This was extraordinary, but not decisive. Recent observations with the <strong>James Webb Space Telescope (JWST).<\/strong> have now demonstrated even more important molecules: <strong>methane<\/strong> and <strong>carbon dioxide<\/strong>. Both may indicate biological processes.<\/p>\n\n<p class=\"wp-block-paragraph\">Moreover, there is weak evidence for <strong>dimethyl sulfide (DMS)<\/strong>, a molecule produced on Earth almost exclusively by living organisms, particularly plankton in oceans.<\/p>\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/blogs.nasa.gov\/webb\/\" target=\"_blank\" rel=\"noopener\">Source: NASA James Webb Space Telescope Observations<\/a><\/p>\n<\/blockquote>\n\n<p class=\"wp-block-paragraph\">Important to realize: <strong>this is not proof of life.<\/strong> For example, methane can also be created by non-biological processes.<\/p>\n\n<h2 class=\"wp-block-heading\">What is a Hycean World?<\/h2>\n\n<p class=\"wp-block-paragraph\">One hypothesis is that K2-18b is a so-called <strong>Hycean World<\/strong> is: a planet with a thin, hydrogen-rich atmosphere and a vast ocean beneath it. In such an environment, microbial life and photochemical processes similar to those on Earth would be possible.<\/p>\n\n<p class=\"wp-block-paragraph\">A Hycean World would strongly indicate biological activity in the presence of high concentrations of methane (as well as relatively low concentrations of other gases such as ammonia). The detection of DMS supports this idea, but the observations are not yet certain enough.<\/p>\n\n<h2 class=\"wp-block-heading\">How reliable are the measurements?<\/h2>\n\n<p class=\"wp-block-paragraph\">Scientists use a so-called 'sigma score' to indicate reliability:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>2 sigma:<\/strong> about 95% for sure (similar to 1 in 20 chance of wrong conclusion).<\/li>\n\n<li><strong>3 sigma:<\/strong> about 99.7% for sure (1 in 1000 chance).<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">The DMS detection at K2-18b now sits at about <strong>2-3 sigma<\/strong>. This is exciting, but not yet convincing enough for firm claims. More observations with the JWST are planned to confirm or refute the data.<\/p>\n\n<h2 class=\"wp-block-heading\">Why are biomarkers alone not enough for the K2-18b planet?<\/h2>\n\n<p class=\"wp-block-paragraph\">Even if methane and DMS are present, that does not automatically mean there is life. There may be unknown geological or chemical processes producing these molecules. As one of the scientists involved stated: <strong>\"There is no single molecule that proves life on its own.\"<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">Therefore, follow-up research remains crucial. Science looks for patterns: combinations of molecules that together are difficult to explain without biological activity.<\/p>\n\n<h2 class=\"wp-block-heading\">How can you yourself contribute to exoplanet research?<\/h2>\n\n<p class=\"wp-block-paragraph\">Although K2-18b itself is not visible with amateur telescopes, you can observe stars that may harbor exoplanets. Smart telescopes such as the <strong><a href=\"https:\/\/www.telescoop.nl\/en\/dwarf-3-smart-telescope\/\" data-type=\"product\" data-id=\"7411\">DWARF 3<\/a><\/strong> make this accessible:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Automatic tracking and stacking allow you to measure variations in starlight.<\/li>\n\n<li>Some stars show small dips in brightness as planets move past them (transits).<\/li>\n\n<li>With patience and good equipment, you can even contribute to citizen science projects.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Check out the capabilities of the <a href=\"https:\/\/www.telescoop.nl\/en\/dwarf-3-smart-telescope\/\">DWARF 3 smart telescope<\/a> for beginners.<\/p>\n\n<h2 class=\"wp-block-heading\">Summary: hope, but no proof yet<\/h2>\n\n<p class=\"wp-block-paragraph\">The <strong>k2-18b planet<\/strong> offers a fascinating glimpse into the complexity of the search for extraterrestrial life. The presence of molecules such as water vapor, methane and possibly dimethyl sulfide makes K2-18b a prime candidate. But as always in science: extraordinary claims require extraordinary evidence.<\/p>\n\n<p class=\"wp-block-paragraph\">With new observations and better technology, the truth is getting closer step by step.<\/p>\n\n<p class=\"wp-block-paragraph\">Keep looking at the stars, because the universe is far from giving away all its secrets.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>De k2-18b planeet is de afgelopen jaren uitgegroeid tot een van de meest intrigerende exoplaneten. Niet omdat we er leven hebben gevonden, maar omdat wetenschappers sporen hebben gedetecteerd die mogelijk wijzen op biologische processen. Wat maakt K2-18b zo bijzonder? En hoe ver zijn we echt in de zoektocht naar leven? In deze blog duiken we [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":14153,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[168,2985],"tags":[],"class_list":["post-14152","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie-kenniscentrum","category-astronomie-101"],"acf":[],"jetpack_featured_media_url":"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/Esa-hubble-k2-18a_impression-scaled.jpg","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":14155,"url":"https:\/\/www.telescoop.nl\/en\/voorwaarden-voor-buitenaards-leven\/","url_meta":{"origin":14152,"position":0},"title":"Conditions for extraterrestrial life: what do science and latest discoveries say?","author":"Info telescoop","date":"17-05-2025","format":false,"excerpt":"Het universum is enorm \u2014 alleen al in onze Melkweg zijn er naar schatting meer dan 100 miljard sterren. Dat roept een fascinerende vraag op: wat zijn de voorwaarden voor buitenaards leven? In deze blog duiken we in de nieuwste inzichten van astronomen en astrobiologen, en leggen we uit welke\u2026","rel":"","context":"In &quot;Astronomie Kenniscentrum&quot;","block_context":{"text":"Astronomie Kenniscentrum","link":"https:\/\/www.telescoop.nl\/en\/astronomie-kenniscentrum\/astronomie-kenniscentrum\/"},"img":{"alt_text":"voorwaarden voor buitenaards leven","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/pexels-spacex-586030.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/pexels-spacex-586030.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/pexels-spacex-586030.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/pexels-spacex-586030.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/04\/pexels-spacex-586030.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":14632,"url":"https:\/\/www.telescoop.nl\/en\/wat-doet-de-james-webb-telescoop\/","url_meta":{"origin":14152,"position":1},"title":"What does the James Webb telescope do? A new look at the universe","author":"Info telescoop","date":"06-06-2025","format":false,"excerpt":"Het is het duurste, krachtigste en gevoeligste observatie-instrument dat de mens ooit de ruimte in heeft gestuurd: de James Webb Space Telescope. Maar wat doet de James Webb telescoop eigenlijk precies? En waarom is hij zoveel belangrijker dan eerdere telescopen zoals Hubble? In deze uitgebreide blog duiken we in de\u2026","rel":"","context":"In &quot;Astronomie Kenniscentrum&quot;","block_context":{"text":"Astronomie Kenniscentrum","link":"https:\/\/www.telescoop.nl\/en\/astronomie-kenniscentrum\/astronomie-kenniscentrum\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/JWST-Cold-Side-e1748781744296.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/JWST-Cold-Side-e1748781744296.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/JWST-Cold-Side-e1748781744296.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/JWST-Cold-Side-e1748781744296.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/JWST-Cold-Side-e1748781744296.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":5162,"url":"https:\/\/www.telescoop.nl\/en\/planeten-waarvan-je-niet-gelooft-dat-ze-bestaan-volume-2-corot-7b\/","url_meta":{"origin":14152,"position":2},"title":"Planets you don't believe exist: Volume 2 - COROT-7b","author":"admin","date":"22-11-2024","format":false,"excerpt":"Als je dacht dat HD 189733 b al onvoorstelbaar was met zijn glasregens en onstuimige weerpatronen, dan zal COROT-7b je zeker niet teleurstellen. Deze exoplaneet is misschien wel een van de meest bizarre werelden die we tot nu toe hebben ontdekt. COROT-7b bevindt zich op slechts 480 lichtjaar van ons\u2026","rel":"","context":"In &quot;Astronomie 101&quot;","block_context":{"text":"Astronomie 101","link":"https:\/\/www.telescoop.nl\/en\/astronomie-kenniscentrum\/astronomie-101\/"},"img":{"alt_text":"COROT-7B","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/COROT-7B-scaled-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/COROT-7B-scaled-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/COROT-7B-scaled-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/COROT-7B-scaled-1.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/COROT-7B-scaled-1.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/COROT-7B-scaled-1.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":14408,"url":"https:\/\/www.telescoop.nl\/en\/poollicht-op-mars\/","url_meta":{"origin":14152,"position":3},"title":"Aurora on Mars: a green spectacle in the red sky","author":"Info telescoop","date":"19-05-2025","format":false,"excerpt":"Poollicht op Mars\u2014het klinkt als sciencefiction, maar sinds kort is het harde realiteit. In maart 2024 werd een unieke gebeurtenis vastgelegd door NASA\u2019s Perseverance rover: voor het eerst is aurora op een andere planeet dan de aarde vanaf het oppervlak gefotografeerd in zichtbaar licht. Geen ultraviolet of infrarood, maar een\u2026","rel":"","context":"In &quot;Astronomie Kenniscentrum&quot;","block_context":{"text":"Astronomie Kenniscentrum","link":"https:\/\/www.telescoop.nl\/en\/astronomie-kenniscentrum\/astronomie-kenniscentrum\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/05\/poollicht-op-mars.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/05\/poollicht-op-mars.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/05\/poollicht-op-mars.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/05\/poollicht-op-mars.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":5159,"url":"https:\/\/www.telescoop.nl\/en\/planeten-waarvan-je-niet-gelooft-hd-189733\/","url_meta":{"origin":14152,"position":4},"title":"Planets you don't believe exist: HD 189733","author":"admin","date":"20-11-2024","format":false,"excerpt":"Stel je een planeet voor die op het eerste gezicht betoverend lijkt, met een prachtige blauwe gloed, bijna alsof je naar een tweede Aarde kijkt. Maar deze blauwgekleurde exoplaneet, HD 189733 b, is alles behalve een vredige, oceaanachtige wereld. In werkelijkheid is het een planeet die alles wat wij kennen\u2026","rel":"","context":"In &quot;Astronomie 101&quot;","block_context":{"text":"Astronomie 101","link":"https:\/\/www.telescoop.nl\/en\/astronomie-kenniscentrum\/astronomie-101\/"},"img":{"alt_text":"HD 189733B","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/Planet_HD_189733b-scaled-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/Planet_HD_189733b-scaled-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/Planet_HD_189733b-scaled-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/Planet_HD_189733b-scaled-1.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/Planet_HD_189733b-scaled-1.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2024\/11\/Planet_HD_189733b-scaled-1.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":14601,"url":"https:\/\/www.telescoop.nl\/en\/waarom-jupiter-krimpt\/","url_meta":{"origin":14152,"position":5},"title":"Why Jupiter is shrinking","author":"Info telescoop","date":"02-06-2025","format":false,"excerpt":"Het klinkt bijna als sciencefiction, maar het is echt waar: Jupiter krimpt. De grootste planeet van ons zonnestelsel blijkt niet altijd zo geweest te zijn. 4,5 miljard jaar geleden was hij zelfs twee keer zo groot. En nog steeds is hij aan het samentrekken \u2014 langzaam maar gestaag. En dat\u2026","rel":"","context":"In &quot;Astronomie Kenniscentrum&quot;","block_context":{"text":"Astronomie Kenniscentrum","link":"https:\/\/www.telescoop.nl\/en\/astronomie-kenniscentrum\/astronomie-kenniscentrum\/"},"img":{"alt_text":"jupiter krimpt","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/57835cc6-9d29-469c-86dc-aba09546fa39.webp?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/57835cc6-9d29-469c-86dc-aba09546fa39.webp?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/57835cc6-9d29-469c-86dc-aba09546fa39.webp?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/57835cc6-9d29-469c-86dc-aba09546fa39.webp?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/06\/57835cc6-9d29-469c-86dc-aba09546fa39.webp?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/posts\/14152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=14152"}],"version-history":[{"count":1,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/posts\/14152\/revisions"}],"predecessor-version":[{"id":89962,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/posts\/14152\/revisions\/89962"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/14153"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=14152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/categories?post=14152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/tags?post=14152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}